| 单词 |
Appleton layer |
| 释义 |
Appleton layer- 英?[??plt?n ?lei?]
- 美?[??p?lt?n ?le?]
英英释义Noun1. the highest region of the ionosphere (from 90 to 600 miles up) that contains the highest concentration of free electrons and is most useful for long-range radio transmission
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| 随便看 |
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